I added a few revisions from the previous version.

1 Reduced motor mounts to 2.5mm thick (the rest of the frame is 5mm) to recue weight and keep weight more centered.
2 Added extra material around the front and rear standoffs to increase the stiffness in the arms and improve durability.
3 Added a lipo system that weighs about the same as my typical rubberbands that I used.
4 I printed this version in a Carbon Fiber/ PLA mix. I used CooBeen Carbon Fiber PLA found on Amazon. It prints really nicely.

                Pro's of Carbon Fiber PLA
                 The frame is slightly more rigid than the PLA. This allows for a more aggressive tune.
                 The matte black looks amazing
                 prints very nice.

                 Con's
                 The frame was about .25g heavier than a PLA frame. (8.8g/PLA to 9.3/CF+PLA)
                 I haven't broken the PLA or Carbon Fiber frames yet, so both seem durable. Although, I would expect the PLA frame to be more durable due to the extra flexiblity. 

This last change isn't frame related, but I switch out my 1203 6200kv to 1202.5 8000kv (output limit to about 7000kv)

Dry weight is 49g and I fly with a 450mah 3s Lipo

1202.5 8000kv motors
Crazybee FC
Aio 25mw camera
xm rx
Gemfan 65mm props

Flight Video here:

I posted the STL's on thingiverse in case someone else wanted to experiment.